Add story-to-pack research and a structured situation review

Research toward building a content pack from a story corpus, kept on its own
branch and independent of the game. Records the selection experiments against
blind labels, and settles selection as gate G2 followed by a human review:
review.py writes REVIEW.md and a review.json form, apply_review.py checks the
filled form and writes situations.json for the next stage.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01C6UDQ9o6L6Ey173U7XVou6

tools/story-to-pack/probe/validate-result.json

@@ -0,0 +1,25 @@
+{
+ "criteria": [
+  false,
+  true,
+  false
+ ],
+ "V1": [
+  10,
+  8,
+  2,
+  0.8
+ ],
+ "V2": [
+  4,
+  3,
+  0,
+  0.75
+ ],
+ "V3": [
+  13,
+  2,
+  10,
+  0.7692307692307693
+ ]
+}